Shelf



FIG. 1 is a front perspective view of a shelf of Embodiment One, showingmy new design;

FIG. 2 is a bottom perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a rear side view thereof;

FIG. 7 is a left side view thereof;

FIG. 8 is a front perspective view of a shelf of Embodiment Two;

FIG. 9 is a bottom perspective view thereof;

FIG. 10 is a bottom view thereof; and,

FIG. 11 is a top view thereof.

CLAIM I claim the ornamental design for a shelf, as shown and described.